Substrings of Size Three with Distinct Characters: coding question

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Count how many contiguous substrings of length three in s contain three distinct characters. This is a straightforward fixed-size sliding-window / uniqueness-check problem (s length ≤ 100, lowercase letters).

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Leetcode 1876. Substrings of Size Three with Distinct Characters
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Substrings of Size Three with Distinct Characters

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Substrings of Size Three with Distinct Characters

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